本文观察临床根管治疗术的228例,结果表明肉眼观察牙髓坏死多有根尖损害。肉眼直视根管口与探寻根管数常有误差。单根牙出现在第二双尖牙,多根牙常出现在上下颌第二磨牙。差误主要原因是根管口的变异或直视困难。50岁以上上颌磨牙视、探差误缩小,其原因与牙增龄变化有关。 In this paper, 228 cases of clinical root canal therapy were observed, the results showed that there is more macular necrosis of the root tip damage. Looking at the root canal with the naked eye and explore the root canal often have errors. A single tooth appears in the second pair of canines, multiple teeth often appear in the upper and lower jaw second molar. The main reason for the error is the variation of the root orifice or the difficulty of looking directly. Maxillary molar over the age of 50 depending on sight, exploration error error narrowing, the reason and the age-related changes in teeth.